Keenan, M. (2002). From Stockholm to Johannesburg: An historical overview of the concern of the Holy See for the environment; 1972 - 2002. Libreria editrice vaticana.
Cita Chicago Style (17a ed.)Keenan, Marjorie. From Stockholm to Johannesburg: An Historical Overview of the Concern of the Holy See for the Environment; 1972 - 2002. Vatican city: Libreria editrice vaticana, 2002.
Cita MLA (8a ed.)Keenan, Marjorie. From Stockholm to Johannesburg: An Historical Overview of the Concern of the Holy See for the Environment; 1972 - 2002. Libreria editrice vaticana, 2002.
Precaución: Estas citas no son 100% exactas.